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关注：1
2013-05-23 12:21
求翻译：We have only one earth . In most of cities in all over the world, people always have to live in the polluted air. Heavy traffic and factories cause this. The gas, which is made by the cars and factories, is poisonous. They cause air pollution in the city. As a result, in 1952, thick dark pieces of cloud came down over 是什么意思？ 待解决
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We have only one earth . In most of cities in all over the world, people always have to live in the polluted air. Heavy traffic and factories cause this. The gas, which is made by the cars and factories, is poisonous. They cause air pollution in the city. As a result, in 1952, thick dark pieces of cloud came down over
问题补充： |
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